This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X700LB, with the same bore, stroke, output force, port and mounting, so it fits the same application. The SAI replacement keeps the same ISO 15552 mounting interface, bore, stroke, output force and accessories, so it drops straight into existing fixtures. It is the current-production version of this cylinder with an upgraded piston seal.
Airtac SI125 Standard Cylinder SI125X700LB
The AirTAC SI125 Standard Cylinder SI125X700LB is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 700mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X700LB, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke700 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X700LB
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SI125 Standard Cylinder SI125X700LB
The AirTAC SI125X700LB is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 700 mm stroke. It delivers 6136 N push force at 0.5 MPa through a G1/2 port. The direct replacement is the SAI125X700LB, which shares the exact same ISO 15552 mounting interface, bore, stroke, force, port and LB foot mounting. The SAI upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life.
Because this SKU lacks the -S magnet, it cannot accept a position sensor. Note that a plain cylinder drifts on air loss; the air cushion only decelerates near stroke end. For held loads, use an external rod lock or the SAIL/BSAI lock variants the SI line lacked.
Airtac SI125 Standard Cylinder SI125X700LB Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X700LB |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X700LB |
| Bore size | Ø125 mm |
| Stroke | 700 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2.0 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 500 mm/s |
| Cushion | Adjustable, 40 mm |
| Max standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI125X700LB carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 kgf | |
The SAI125X700LB produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI125 Standard Cylinder SI125X700LB
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×700 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Legacy SI-family variants: SID (double rod), SIJ (adjustable stroke) — each maps to its SAI equivalent (SID→SAID, SIJ→SAIJ). Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B).
Where the Airtac SI125 Standard Cylinder SI125X700LB Is Used
Heavy Stamp Press Feed
Drives heavy material stages in stamping lines where the 6136 N push force at 0.5 MPa easily overcomes blank holder resistance.
Pallet Transfer Gate
Actuates large load-diverter gates on packaging conveyors, utilizing the 700 mm stroke to fully clear pallet pathways.
Replacing the Airtac SI125 Standard Cylinder SI125X700LB with the SAI125X700LB
To replace the SI125X700LB, order the SAI125X700LB. Confirm the ISO 15552 LB foot mounting interface, 125 mm bore, 700 mm stroke, G1/2 port (PT/G/NPT thread options), and M27x2 rod thread. Since this SKU has no -S magnet, it cannot take a CS1-B/DS1-B sensor; if sensing is needed, switch to a magnet-equipped SAI. Sizing both ways: the 125 mm bore yields 6136 N push at 0.5 MPa, while the neighboring 100 mm bore offers 3927 N. For load holding on air loss, a plain cylinder drifts—the cushion only decelerates—so specify a pilot check valve, external rod lock, or the SAIL/BSAI lock variant. With a 700 mm stroke, use external guides to prevent rod bending and side-load damage. Operating speed is 30-500 mm/s.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X700LB
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI125 Standard Cylinder SI125X700LB FAQ
Yes, the AirTAC SI125X700LB is discontinued. The direct replacement is the SAI125X700LB. It is dimensionally interchangeable per the ISO 15552 mounting interface, retaining the same 125 mm bore, 700 mm stroke, output force, G1/2 port, and LB foot mount.
The bore dictates a G1/2 air port and M27x2 rod thread. Force output is 6136 N push and 5734 N pull at 0.5 MPa, 8590 N push at 0.7 MPa, and 11045 N push at 0.9 MPa. The theoretical maximum force is 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X700LB
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